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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36801 results found.

  1. Swift-BAT trigger 322590 is not a GRB
  2. Swift trigger 322590: BAT detection of a possible burst
  3. GRB 080828: SuperAGILE GRB Localization
  4. GRB080823: Fermi Gamma-ray Burst Monitor detection
  5. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  6. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  7. Konus-Wind observation of GRB 080825B
  8. GRB080825C: GLAST Burst Monitor detection
  9. GRB 080825B: Swift-XRT team analysis
  10. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  11. GRB080825: Afterglow confirmation and redshift estimate
  12. GRB 080825B - optical counterpart candidate
  13. GRB 080825B: GRB Localization by SuperAGILE
  14. GRB 080822B, Swift-BAT refined analysis
  15. GRB 080822B: MASTER optical observation
  16. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  17. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  18. GRB 080822B: Swift detection of a burst
  19. GRB080818B: GLAST Burst Monitor detection
  20. GRB 080822 (SGR 0501+4516): archival optical observations
  21. New Soft Gamma Repeater 0501+4516 was GRB 080822
  22. GRB 080822: Swift detection of a short burst
  23. GLAST Burst Monitor detection of a GRB: 080816B
  24. GLAST Burst Monitor detection of GRB 080818
  25. GLAST Burst Monitor detection of GRB080817B
  26. GLAST Burst Monitor detection of GRB 080817
  27. GLAST Burst Monitor detection of GRB080816
  28. GRB080810 - optical observations
  29. GRB080810: optical observations
  30. GLAST Burst Monitor detection of GRB 080812
  31. Radio detection of GRB 080810 with the VLA
  32. GRB 080810: RTT150 optical observations
  33. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  34. GLAST Burst Monitor detection of GRB 080810
  35. GRB 080810: Liverpool and Faulkes North observations
  36. GRB 080810: RTT150 optical observations
  37. GRB080810: MITSuME optical observation
  38. First GLAST Burst Monitor GRB Circulars
  39. GRB 080810: Swift/UVOT Refined Analysis
  40. GRB 080810: optical observations
  41. GRB 080810: Liverpool Telescope observations
  42. GRB 080810: D50 optical observation
  43. GRB 080810: Kanazawa optical observation
  44. GRB 080810: OSN follow-up
  45. GRB 080810: Observations from NOT
  46. GRB 080810: RTT150 optical observations
  47. GRB 080810: Swift-XRT Team refined analysis
  48. GRB 080810: Enhanced Swift-XRT position
  49. GRB 080810: KANATA optical-NIR observation, update
  50. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  51. GRB 080810: Keck/HIRES Spectroscopy
  52. GRB 080810, Swift-BAT refined analysis
  53. GRB 080810 : optical observation with KANATA
  54. GRB 080810: Swift detection of a burst with a bright optical afterglow
  55. GRB 080723B: GROND upper limits
  56. GRB 080723B: XMM-Newton observation
  57. GRB 080805: VLT redshift update
  58. GRB 080805: Faulkes Telescope South optical observations
  59. GRB 080804: GROND observations
  60. GRB 080727B: Late VLT imaging
  61. GRB 080804: ATCA Radio Observations
  62. GRB 080805: Swift-XRT Refined Analysis
  63. GRB 080805: Swift/UVOT Upper Limits
  64. GRB 080804: Swift-XRT Refined Analysis
  65. GRB 080804: Swift/UVOT Refined Analysis
  66. GRB 080805, Swift-BAT refined analysis
  67. GRB 080804, Swift-BAT refined analysis
  68. GRB 080804: Enhanced Swift-XRT position
  69. GRB080804: Gemini South redshift confirmation
  70. GRB 080804: Faulkes Telescope South observations
  71. GRB080805 optical limit by "Pi of the Sky"
  72. GRB 080805: VLT redshift
  73. GRB 080805: Afterglow confirmation
  74. GRB 080805: GROND detection of possible afterglow
  75. GRB 080805: Swift detection of a burst
  76. GRB 080804: UVES redshift
  77. GRB 080804: Swift detection of a burst with optical afterglow
  78. GRB 080804: ROTSE-III Detection of Optical Counterpart
  79. GRB 080802: Swift/UVOT Upper Limits
  80. GRB 080802: Swift-XRT Refined Analysis
  81. GRB 080802: UVI Telescope Upper Limit
  82. GRB 080802, Swift-BAT refined analysis
  83. GRB 080802: Swift detection of a probable burst
  84. GRB 080727C: Suzaku WAM observation of the prompt emission
  85. GRB 080727B: IR photometry
  86. GRB 080727A: Early IR observations
  87. GRB 080727C: TAROT Calern observatory optical observations
  88. GRB 080727B: KAIT photometry and an early lightcurve break
  89. GRB 080727B: GROND redshift limit
  90. GRB 080727C, Swift-BAT refined analysis
  91. GRB 080727C: Swift/UVOT Upper Limits
  92. Konus-Wind observation of GRB 080727B
  93. GRB 080727C: Swift XRT refined analysis
  94. GRB 080727C: Liverpool Telescope observations
  95. GRB 080727A: VLT upper limits
  96. GRB 080727C: Enhanced Swift-XRT position
  97. GRB 080727B: REM NIR afterglow prompt detection
  98. GRB080727C: RTT150 optical observations
  99. GRB 080727C: Swift detection of a burst
  100. GRB 080727B: Swift/UVOT Upper Limits

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